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https://issues.apache.org/jira/browse/YARN-2972?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14251482#comment-14251482
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Hudson commented on YARN-2972:
------------------------------
FAILURE: Integrated in Hadoop-Yarn-trunk #779 (See
[https://builds.apache.org/job/Hadoop-Yarn-trunk/779/])
YARN-2972. DelegationTokenRenewer thread pool never expands. Contributed by
Jason Lowe (junping_du: rev 2b4b0e8847048850206f091c6870a02e08cfe836)
*
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/security/DelegationTokenRenewer.java
* hadoop-yarn-project/CHANGES.txt
> DelegationTokenRenewer thread pool never expands
> ------------------------------------------------
>
> Key: YARN-2972
> URL: https://issues.apache.org/jira/browse/YARN-2972
> Project: Hadoop YARN
> Issue Type: Bug
> Components: resourcemanager
> Affects Versions: 2.3.0
> Reporter: Jason Lowe
> Assignee: Jason Lowe
> Fix For: 2.7.0
>
> Attachments: YARN-2972.001.patch
>
>
> DelegationTokenRenewer uses a thread pool to manage token renewals. The
> number of threads is configurable, but unfortunately the pool never expands
> beyond the hardcoded initial 5 threads because we are using an unbounded
> LinkedBlockingQueue. ThreadPoolExecutor only grows the thread pool beyond
> the core size when the specified queue is full.
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